Sadly, boss progression is not linear in heroic.
Regardless, it is higher between every step on the way on the heroic progression. Which would mean that maybe boss X have a lower value but that means boss Y would have a higher value.
This is the best way to count heroic progression as it still shows how many bosses each guild have killed.
If you are really that bothered about it you can count the average instead. Which is very obviously higher in heroic.
---------- Post added 2013-05-29 at 05:03 PM ----------
I am not really joking or exaggarting. We had people claiming "Oh, I killed LK25HC", forgetting to mention that it was 3 months ago. They do not think we bother checking it up with 1 mouse click on their armory.
We had a guy applying just today that still had 3 green items on him and unenchanted gear.
Several people have expressed bad feelings towards having to actually write an apply.
Today we actually had to first guy in weeks that actually asked us before we asked him if he should make an apply somewhere.
We have seen dpsers pushing only 50-80k dps in ToT gear.
Healers... oh god... dont get me started on healers... Where did they all go?
So no, I am not really exaggerating at all. Recruitment is a horrible, horrible state right now.